-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

if module:get_host_type() ~= "component" then

	error("MUC should be loaded as a component, please see https://prosody.im/doc/components", 0);

end

local muclib = module:require "muc";

room_mt = muclib.room_mt; -- Yes, global.

local affiliation_notify = module:require "muc/affiliation_notify"; -- luacheck: ignore 211

local name = module:require "muc/name";

room_mt.get_name = name.get;

room_mt.set_name = name.set;

local description = module:require "muc/description";

room_mt.get_description = description.get;

room_mt.set_description = description.set;

local hidden = module:require "muc/hidden";

room_mt.get_hidden = hidden.get;

room_mt.set_hidden = hidden.set;

function room_mt:get_public()

	return not self:get_hidden();

end

function room_mt:set_public(public)

	return self:set_hidden(not public);

end

local password = module:require "muc/password";

room_mt.get_password = password.get;

room_mt.set_password = password.set;

local members_only = module:require "muc/members_only";

room_mt.get_members_only = members_only.get;

room_mt.set_members_only = members_only.set;

local moderated = module:require "muc/moderated";

room_mt.get_moderated = moderated.get;

room_mt.set_moderated = moderated.set;

local persistent = module:require "muc/persistent";

room_mt.get_persistent = persistent.get;

room_mt.set_persistent = persistent.set;

local subject = module:require "muc/subject";

room_mt.get_changesubject = subject.get_changesubject;

room_mt.set_changesubject = subject.set_changesubject;

room_mt.get_subject = subject.get;

room_mt.set_subject = subject.set;

room_mt.send_subject = subject.send;

local history = module:require "muc/history";

room_mt.send_history = history.send;

room_mt.get_historylength = history.get_length;

room_mt.set_historylength = history.set_length;

local jid_split = require "util.jid".split;

local jid_bare = require "util.jid".bare;

local st = require "util.stanza";

local cache = require "util.cache";

local um_is_admin = require "core.usermanager".is_admin;

module:depends("disco");

module:add_identity("conference", "text", module:get_option_string("name", "Prosody Chatrooms"));

module:add_feature("http://jabber.org/protocol/muc");

module:depends "muc_unique"

module:require "muc/lock";

local function is_admin(jid)

	return um_is_admin(jid, module.host);

end

do -- Monkey patch to make server admins room owners

	local _get_affiliation = room_mt.get_affiliation;

	function room_mt:get_affiliation(jid)

		if is_admin(jid) then return "owner"; end

		return _get_affiliation(self, jid);

	end

	local _set_affiliation = room_mt.set_affiliation;

	function room_mt:set_affiliation(actor, jid, affiliation, reason)

		if affiliation ~= "owner" and is_admin(jid) then return nil, "modify", "not-acceptable"; end

		return _set_affiliation(self, actor, jid, affiliation, reason);

	end

end

local persistent_rooms_storage = module:open_store("persistent");

local persistent_rooms = module:open_store("persistent", "map");

local room_configs = module:open_store("config");

local room_state = module:open_store("state");

local room_items_cache = {};

local function room_save(room, forced, savestate)

	local node = jid_split(room.jid);

	local is_persistent = persistent.get(room);

	room_items_cache[room.jid] = room:get_public() and room:get_name() or nil;

	if is_persistent or savestate then

		persistent_rooms:set(nil, room.jid, true);

		local data, state = room:freeze(savestate);

		room_state:set(node, state);

		return room_configs:set(node, data);

	elseif forced then

		persistent_rooms:set(nil, room.jid, nil);

		room_state:set(node, nil);

		return room_configs:set(node, nil);

	end

end

local eviction_hit_rate = module:measure("room_eviction", "rate");

local rooms = cache.new(module:get_option_number("muc_room_cache_size", 100), function (jid, room)

	module:log("debug", "Evicting room %s", jid);

	eviction_hit_rate();

	room_items_cache[room.jid] = room:get_public() and room:get_name() or nil;

	room_save(room, nil, true); -- Force to disk

end);

-- Automatically destroy empty non-persistent rooms

module:hook("muc-occupant-left",function(event)

	local room = event.room

	if not room:has_occupant() and not persistent.get(room) then -- empty, non-persistent room

		module:fire_event("muc-room-destroyed", { room = room });

	end

end, -1);

function track_room(room)

	rooms:set(room.jid, room);

	-- When room is created, over-ride 'save' method

	room.save = room_save;

end

local function restore_room(jid)

	local node = jid_split(jid);

	local data = room_configs:get(node);

	local state = room_state:get(node);

	if data then

		module:log("debug", "Restoring room %s from storage", jid);

		local room = muclib.restore_room(data, state);

		track_room(room);

		return room;

	end

end

function forget_room(room)

	module:log("debug", "Forgetting %s", room.jid);

	rooms.save = nil;

	rooms:set(room.jid, nil);

end

function delete_room(room)

	module:log("debug", "Deleting %s", room.jid);

	room_configs:set(jid_split(room.jid), nil);

	persistent_rooms:set(nil, room.jid, nil);

	room_items_cache[room.jid] = nil;

end

function module.unload()

	for room in rooms:values() do

		room:save(nil, true);

		forget_room(room);

	end

end

function get_room_from_jid(room_jid)

	local room = rooms:get(room_jid);

	if room then

		rooms:set(room_jid, room); -- bump to top;

		return room;

	end

	return restore_room(room_jid);

end

function create_room(room_jid)

	local exists = get_room_from_jid(room_jid);

	if exists then

		return nil, "room-exists";

	end

	local room = muclib.new_room(room_jid);

	module:fire_event("muc-room-created", {

		room = room;

	});

	return room;

end

function each_room(local_only)

	if local_only then

		return rooms:values();

	end

	return coroutine.wrap(function ()

		local seen = {}; -- Don't iterate over persistent rooms twice

		for room in rooms:values() do

			coroutine.yield(room);

			seen[room.jid] = true;

		end

		for room_jid in pairs(persistent_rooms_storage:get(nil) or {}) do

			if not seen[room_jid] then

				local room = restore_room(room_jid);

				if room == nil then

					module:log("error", "Missing data for room '%s', omitting from iteration", room_jid);

				else

					coroutine.yield(room);

				end

			end

		end

	end);

end

module:hook("host-disco-items", function(event)

	local reply = event.reply;

	module:log("debug", "host-disco-items called");

	if next(room_items_cache) ~= nil then

		for jid, room_name in pairs(room_items_cache) do

			reply:tag("item", { jid = jid, name = room_name }):up();

		end

	else

		for room in each_room() do

			if not room:get_hidden() then

				local jid, room_name = room.jid, room:get_name();

				room_items_cache[jid] = room_name;

				reply:tag("item", { jid = jid, name = room_name }):up();

			end

		end

	end

end);

module:hook("muc-room-created", function(event)

	track_room(event.room);

end, -1000);

module:hook("muc-room-destroyed",function(event)

	local room = event.room;

	forget_room(room);

	delete_room(room);

end);

do

	local restrict_room_creation = module:get_option("restrict_room_creation");

	if restrict_room_creation == true then

		restrict_room_creation = "admin";

	end

	if restrict_room_creation then

		local host_suffix = module.host:gsub("^[^%.]+%.", "");

		module:hook("muc-room-pre-create", function(event)

			local origin, stanza = event.origin, event.stanza;

			local user_jid = stanza.attr.from;

			if not is_admin(user_jid) and not (

				restrict_room_creation == "local" and

				select(2, jid_split(user_jid)) == host_suffix

			) then

				origin.send(st.error_reply(stanza, "cancel", "not-allowed", "Room creation is restricted"));

				return true;

			end

		end);

	end

end

for event_name, method in pairs {

	-- Normal room interactions

	["iq-get/bare/http://jabber.org/protocol/disco#info:query"] = "handle_disco_info_get_query" ;

	["iq-get/bare/http://jabber.org/protocol/disco#items:query"] = "handle_disco_items_get_query" ;

	["iq-set/bare/http://jabber.org/protocol/muc#admin:query"] = "handle_admin_query_set_command" ;

	["iq-get/bare/http://jabber.org/protocol/muc#admin:query"] = "handle_admin_query_get_command" ;

	["iq-set/bare/http://jabber.org/protocol/muc#owner:query"] = "handle_owner_query_set_to_room" ;

	["iq-get/bare/http://jabber.org/protocol/muc#owner:query"] = "handle_owner_query_get_to_room" ;

	["message/bare"] = "handle_message_to_room" ;

	["presence/bare"] = "handle_presence_to_room" ;

	-- Host room

	["iq-get/host/http://jabber.org/protocol/disco#info:query"] = "handle_disco_info_get_query" ;

	["iq-get/host/http://jabber.org/protocol/disco#items:query"] = "handle_disco_items_get_query" ;

	["iq-set/host/http://jabber.org/protocol/muc#admin:query"] = "handle_admin_query_set_command" ;

	["iq-get/host/http://jabber.org/protocol/muc#admin:query"] = "handle_admin_query_get_command" ;

	["iq-set/host/http://jabber.org/protocol/muc#owner:query"] = "handle_owner_query_set_to_room" ;

	["iq-get/host/http://jabber.org/protocol/muc#owner:query"] = "handle_owner_query_get_to_room" ;

	["message/host"] = "handle_message_to_room" ;

	["presence/host"] = "handle_presence_to_room" ;

	-- Direct to occupant (normal rooms and host room)

	["presence/full"] = "handle_presence_to_occupant" ;

	["iq/full"] = "handle_iq_to_occupant" ;

	["message/full"] = "handle_message_to_occupant" ;

} do

	module:hook(event_name, function (event)

		local origin, stanza = event.origin, event.stanza;

		local room_jid = jid_bare(stanza.attr.to);

		local room = get_room_from_jid(room_jid);

		if room == nil then

			-- Watch presence to create rooms

			if stanza.attr.type == nil and stanza.name == "presence" then

				room = muclib.new_room(room_jid);

				return room:handle_first_presence(origin, stanza);

			elseif stanza.attr.type ~= "error" then

				origin.send(st.error_reply(stanza, "cancel", "item-not-found"));

				return true;

			else

				return;

			end

		end

		return room[method](room, origin, stanza);

	end, -2)

end

function shutdown_component()

	for room in each_room(true) do

		room:save(nil, true);

	end

end

module:hook_global("server-stopping", shutdown_component, -300);

do -- Ad-hoc commands

	module:depends "adhoc";

	local t_concat = table.concat;

	local adhoc_new = module:require "adhoc".new;

	local adhoc_initial = require "util.adhoc".new_initial_data_form;

	local array = require "util.array";

	local dataforms_new = require "util.dataforms".new;

	local destroy_rooms_layout = dataforms_new {

		title = "Destroy rooms";

		instructions = "Select the rooms to destroy";

		{ name = "FORM_TYPE", type = "hidden", value = "http://prosody.im/protocol/muc#destroy" };

		{ name = "rooms", type = "list-multi", required = true, label = "Rooms to destroy:"};

	};

	local destroy_rooms_handler = adhoc_initial(destroy_rooms_layout, function()

		return { rooms = array.collect(each_room()):pluck("jid"):sort(); };

	end, function(fields, errors)

		if errors then

			local errmsg = {};

			for field, err in pairs(errors) do

				errmsg[#errmsg + 1] = field .. ": " .. err;

			end

			return { status = "completed", error = { message = t_concat(errmsg, "\n") } };

		end

		for _, room in ipairs(fields.rooms) do

			get_room_from_jid(room):destroy();

		end

		return { status = "completed", info = "The following rooms were destroyed:\n"..t_concat(fields.rooms, "\n") };

	end);

	local destroy_rooms_desc = adhoc_new("Destroy Rooms", "http://prosody.im/protocol/muc#destroy", destroy_rooms_handler, "admin");

	module:provides("adhoc", destroy_rooms_desc);

end